21 Cards in this Set
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If the current flowing through a circuit of constant resistance is doubled, the power dissipated by that circuit will
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Quadruple
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Nichrome wire, often used for heating elements has resistivity of 1.0x10^-6 Ω∙m at room temperature. Calculate the resistance of a mile (1625m) length of No. 30 wire (radius 0.125m) at room temperature.
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033 ohms
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Materials in which the resistivity becomes essentially zero at very low temperature are referred to as
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Superconductors
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...
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...
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If you connect two identical storage batteries together in series ("+" to "-" to "+" to "-"), and place them in a circuit, the combination will provide
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Twice the voltage, and the same current will flow through each
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Kirchhoff's junction rule is an example of
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Conservation of charge
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Three resistors of 12, 12, and 6.0 Ω are connected in parallel. A 12-V battery is connected to the combination. What is the current through the 6.0 Ω resistor?
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2.0 A
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Three identical resistors are connected in parallel to a battery. If the current of 12 A flows from the battery, how much current flows through any one of the resistors?
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4:00 AM
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A 9 V battery is hooked up to two resistors in series. One has a resistance of 5 ohms, and the other has a resistance of 10 ohms. Several locations along the circuit are marked with letters, as shown in the Figure 19.6. Which statement about this circuit is true?
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The current at A is equal to the current at B, which is equal to the current at C, which is equal to the current at D
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A galvanometer can be converted to a voltmeter by the addition of a
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Large resistance in series
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A coulomb per second is the same as
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An ampere
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What is the maximum number of 100-W light bulbs you can connect in parallel in a 120-V circuit without tripping a 20-A circuit breaker? (Hint: Find the circuit for one bulb first and assume the breaker will not trip until 20 A is exceeded)
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24A
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Although one normally expects current flow through a battery to be in the same direction as the emf, it is possible to have current flowing in the opposite direction.
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Always true
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A 400-W computer (computer plus monitor) is turned on 8.0 hours per day. If electricity costs 10 cents per kWh, how much does it cost to run the computer annually?
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$116.80
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The resistance of a wire is defined as
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(voltage)/(current)
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A parallel-plate capacitor consists of two parallel, square plates that have dimensions 1.0 cm by 1.0 cm. If the plates are separated by 2.0 mm, and the space between them is filled with teflon, what is the capacitance?
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0.93pF
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Three identical resistors are connected in series to a 12-V battery. What is the voltage across any one of the resistors?
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4V
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Consider two copper wires. One has twice the length of the other. How do the resistance of these two wires compare?
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The longer wire has twice the resistance of the shorter wire.
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As more and more capacitors are connected in series, the equivalent capacitance of the combination increases.
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Never true
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Reducing the voltage across a given capacitor by half causes the energy stored in that capacitor to
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Reduce to one fourth
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A 5.0μF, and a 13μF, and a 30μF capacitor are connected in parallel. How much capacitance would a single capacitor need to have to replace the three capacitor?
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48μF
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PHYS 202: Exam 1